TH400 Intermediate Band

The TH400 Intermediate Band from TCI is a precision replacement friction element engineered for TH400 and 4L80E automatic transmissions, where it serves as the critical load-carrying component in the intermediate (second) gear apply circuit. As a mechanic or transmission builder, you understand that worn or glazed intermediate bands are one of the most common culprits behind second-gear slipping, delayed shifts, and eventual transmission failure—especially in modified or high-horsepower vehicles where stock components face elevated torque loads. This Kevlar-lined band addresses those exact failure modes with premium material construction designed to withstand the abuse of performance driving and heavy-duty applications.

Built with a Kevlar friction surface, the TH400 Intermediate Band delivers superior heat dissipation and consistent holding power compared to organic composite alternatives, which degrade under sustained high temperatures and aggressive shift cycles. The band wraps around the intermediate drum and, when engaged via hydraulic pressure, clamps with precise force to lock the drum and establish gear ratio multiplication—a function that must remain reliable across thousands of shift cycles and temperature swings. TCI's engineering ensures the lining maintains coefficient of friction integrity from cold startup through sustained wide-open-throttle operation, preventing the slippage and energy loss that plague OEM bands in turbocharged, supercharged, or heavily modified powertrains. Weighing 0.88 lbs and dimensioned at 10.1 x 2.2 x 12 inches, it's a direct bolt-in replacement requiring no modification to existing drums or servos.

Rebuilders, street-strip enthusiasts, and heavy-duty truck owners rely on this band when refreshing a TH400 or 4L80E to restore original holding capacity or upgrade to match increased engine output. Whether you're diagnosing a slipping second gear in a full-frame classic car, a Fox-body Mustang, a C10 pickup, or a towing rig, the TH400 Intermediate Band restores the intermediate apply circuit to specification and extends transmission lifespan under demanding conditions. Pair it with a quality rebuild kit, servo upgrade, and fresh hydraulic fluid for a complete restoration that will handle bolt-on modifications, nitrous, or mild turbo applications without the frustration of repeat failures.